Question

A magnet is brought towards a coil (i) speedily (ii) slowly, then the induced e.m.f./induce charge will be respectively

• A. More in first case / More in first case
• B. More in first case / Equal in both case
• C. Less in first case / More in second case
• D. Less in first case / Equal in both case

Answer 1

The correct option is B More in first case / Equal in both case

Enduce EMF $=\frac{d\varphi }{dt}$

it depends on rate of flux change when approaching speed is high then rate will high so EMF induce will me more in 1 case

Charge flow $Q=\frac{n({\varphi }_1-{\varphi }_2)}{R}$

It is independent of time,

Hence Option B is correct.